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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6230d26f1be6ff27d39945d9296d5afabd4fe14e3ca61bf2a9c5665f468b5544' 
  AND token = 'QZMvpx+xsoU3xbWN1MNvcD8+zFNX8vzyPkPJ2+hJIoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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