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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8481b9e8d5a6d244d288ff5e809cb8c3ac082c6190ec227a5388f0e83df06199' 
  AND token = 'DVdtgH1X0HWnfzJNRby1+6+jxG8Rq9fXNMah7SLn6eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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