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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5963cae1febee64ecf6cc767a478786bde1e5d15ce7c95363d7684ad3637788' 
  AND token = 'DWTgG7Lq0NbICYD+5W9dBP7z5r+DvSqf+Ur4djCkpPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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