SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c90b4ccd867f32506ef909e916df7364c2a936899f984a4742dfdd75923a8f' 
  AND token = 'CEmvKWGt1sY3x81Q0xZ/m6hUg0ulFi2eDZNFVwNWyvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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