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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922a8f9b944b99fbde9141387190982306b7664b4ca5a4075fb23d7c8390f19c' 
  AND token = 'e1cfA4Qs63OMxqbi+M/0clWusUu34ohmMt9S6qPnjaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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