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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e1ddee48e3fc4c272bfa69b7ddff7ac15dbe3de056e954ec556e9c693d6d32' 
  AND token = 'Yx5o+ea04x7+u6I5t+QSWGmetzrUrHEiWE2ffaMiwjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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