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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c18532674c5eddbc95047c9c256574c3e38089c2052e0c29ed672266da34dc' 
  AND token = 'FFkAcYb9T3OdylzSXHQ0CRyg9VihXCmv0wQaGk6FdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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