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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f67d669638b9cb0f919368c12d6a9a680095c2a26af7ae031d308339cd17a2' 
  AND token = 'Z9eErIEv3nDs0cZUrvEaikBRADntLdiz2A0Zbtv3ric=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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