SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2154634707f6864d4a6903cd70eb4bc195a5c4877f67fa705ad28367bd91eda9' 
  AND token = 'XvhCFjt96NAwhf5JUYfprPuiP1djx4E0A/lXVBqoNKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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