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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9f8b55bf6d100b6bffba7598172ba27d7ffb567809c3682fa0e7278cc9f595' 
  AND token = 'PKq8L0ssU0Oiwh/Rqw0bYX36FQemghTykgO7b/QdcLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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