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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0148d9914592c85abd3b39297abe92ecb3f88a718c9f28e05c6c6bc3cc4265c0' 
  AND token = '4mAi0HsfmKbBcL3ibOBN/jlmv+jkaVgZxEs5xbrqT+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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