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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83a38f304a5be0f9afc7de5223922e87ac34e154799567fdc1048d6cd577f31' 
  AND token = '/MbaIHH+ylSl6dim6JYYLeTdCg5+Y03g5rcG45vDpDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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