SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d9cb1554275e39a6f0cc40d4ca18d2856396421cc00537ba56b7046079f5a8' 
  AND token = 'pYqbBTcVya9oT/h1abGnhdpqjguaDZSBaViTEwIM/Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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