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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd954c68b236a50280f1efd5282499492b8ba966261d2ec9ff84c569dc87066e' 
  AND token = 'xMm1UWW+dTtIIJXFE2bOSv2EmF9Col3UY7Qr0addIIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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