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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710ef3048ec89e810398d4bc688cfaf3db3d276c942015af480f9d2ad19ba060' 
  AND token = '5cSAHxKM53q3rC6n1hqNXPIRFnfZGIZ5m5tqexe0GVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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