SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca644e00f50801a372d93cc12b31daba2d24e2147862fd78ba7dc261e4f8da5f' 
  AND token = 'vykhgNKGOpI8+kBHXZrdDPTG+X+xjz7znbMYkHGeMbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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