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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a3d6926491e76e4170d6a82891e14a8c7c317d908140dec73b86c8e3540719' 
  AND token = '55DItxKfgS3zPVe584xfcGTM5q/lY+CRzSXDta2dLK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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