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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6ad8635c924e5fa38e4b941ae0e17e9d4bdb99cf6242db4f0aaea3f845f0d9' 
  AND token = 'ZD5YA4XmTTYmDFz2FRB3H5mInosl5aMEry8BkbTQZ8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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