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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef424572c5fc7d3fce3881b41487b59ef50de6b3410695d07a9a6980480ef7d' 
  AND token = '1fVDLTUGJjKJIlbbV5U6erIvNtjELJBX4k2X1Jnpjs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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