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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c727d04e8639aceeb02afa93ceedce395f132a8a8ed94ce64e8dcb97798a6e36' 
  AND token = 'r4017A5rVJShBGxn8T01iiJNeEdQ5P/8eS7QA2lP3vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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