SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a065a1e386e6de01967af924dc2716395fbd2548c693199adac373e5bdbb9b82' 
  AND token = '3En39xzJDIcCZYwkWvf2irrv2hlmDvpwBzF/hoxolM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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