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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdff0667e4c1a2fa155106cefb40271d34ce08f27c6f74f5a3d9e79ab98fd0f8' 
  AND token = 'l8q1mZ/Ke8pmdHSaAgF4m/YpY9iobWlNTZNUFNp3XvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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