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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe375955f7044a0d9d8394ba7548790f9d8f61b437affbc5039e51b25f1bf2b' 
  AND token = 'BW8YdapD9yxu8rZDW9j2lFsKAKNYMd60g8XhgreGVSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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