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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c38fd4c337e59543d49f50d2fe9afd5556c743a52b36e1e5eb22ed9287c06ae' 
  AND token = 'MiC5KLOvwWGV8SbuH9WuTFtlA1JCDKb4hLf0FS7fA2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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