SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0a8332fddea74c8467f2c88e4bf981733ca7026d44c13bc877f8b303cfa022' 
  AND token = '9y/e57P1mPtvQu6CuYPZs+8Dqrd3+HBAL/zgqp9PXWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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