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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8d726aa9d7ffcb3756782dcb8a0d8df4a161017d55f3c23b31a4a908d4e7f9' 
  AND token = 'IiN1oKNIhFUuZLIfN5ZuucWawJwTvDPL6P04JUklmPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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