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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad20b6049146150a076e6c438cd1df29f97a47e3a046e7733d7b9c1c9e6d803' 
  AND token = 'YBsqz0cqRQPtX+9jBmGKHo6X53Kgu41Mgt7d3gFEdhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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