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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7015db71287b7a8272a682b4d4b89d86dac6ca540a98bfff4490e403558ebfba' 
  AND token = 'g+7Y6WjL1mQRb5llIjRyN1krG73Ua40466AtmKEjjZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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