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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320f986ac90c0da96f4c25dda9b0a20d5419b0853f95c5d2af531401683c5d84' 
  AND token = 'Qeh2M6lhM1/w/dwfZofBwvnMmWw5PBbhHJcYa2oP+SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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