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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc00252995fc417d8d1fac1b022b880baebd6589fa2199b064b92ca34f0c96' 
  AND token = 'yT9pBn9agh5kiVMYN4YsjUfBJv6wv3JoJB9oTx+WOt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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