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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd959acb100ab632759d0eb6bdb5b0fdd8c15fd1b6984b98e9b5c0309a7144f2b' 
  AND token = 'jLPcw4adFro4qFc0jQGcA1NBfkNy9loCvRb7uSkYwDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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