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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ac3cbebfc1163297bc841b8c9be51b2750cb101b72326a113645808517831d' 
  AND token = 'W4/1J8lCfFsZterpOCea0TfUJOeeC8P+8r7MBe4JbII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}