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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671f92aecb1ea4cd4913491bc22864d75c937f5710570566aaf01a4af27fd35d' 
  AND token = '4hbOhk6RYLmsbIhb/hCyNDUnQP5Icf1V1qTSJF/X9Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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