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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99743e73883919f544c96886386cca6a79a9c4acac3ec76fa31ca6589853a82a' 
  AND token = 'ioBiqjVOvwYzV0zOJXjLqC9pbHS7ZqjDSPRB7cwLjS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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