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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23f2c8cfbd7bb07daf230ade32efda4d3819667d30b93f9cb30dca906a4aba8' 
  AND token = '7zssmQnroD7/utjqZUDmF0Z+OajVRQunKKOaohw+gjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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