SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f8150e5e23fd9b24fe6fa7ce2c41cdb49cc7764bd663fa25d33054fa1f97c5' 
  AND token = 'Gs0+BK+hlsgpSUVGuaowJEufIHh2+5DvBOqw/0Z/MgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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