SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28c0983d22ffa4c5bd05f3db03d579d5c6ef3b4ccb0339786a448cc2fd98c20' 
  AND token = 'gBSZ6++C6Vognev+KWP4u5gW4Gjhw3fTg3Tp/CajONY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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