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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9fad5061354339acd4a9fc469f56a4be57c8ebf4347b4dcc424140e4d9dee73' 
  AND token = 'FJ3FYuxiGYU/iGhGtfErK9hiPjTSd90S6RamdX5P/KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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