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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6a648dedbae5a36d7f81e71781501dbd6ba891be956668c98dbed5ab315164' 
  AND token = 'bK6hqmc3fJJMQV54xFDkSOG0dL9tacokXSIozEcpi2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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