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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c129b6d7ccd1b6e5dc76bede0d91f41e2b04d151a34e915d05a8a9eb26693c9' 
  AND token = '5oV430eXQVYhNOIhQpqEN6Xqn2iDb6VNQ7w5ivG7ejE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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