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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac77508ca28328f12a96c90d24fb54055efc5ee5a83ed39f2a8cd0326a5c6b1' 
  AND token = '7aOxKi/SJ1RcrGwuPS32r2gC5P1dfsabBUL+D3G7Wds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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