SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feea3b09ebbbf048e3b22202e04edd28ba239942d49ff3448c5746c5688d546d' 
  AND token = 'VbY+Ic0ndVIEuNNPc2jTy89TrmbpoPL0Madrpk4cOyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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