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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc081a23d7da06991e92f39a3187b5c3da1e1b0acdba5f66b3b548e57156a92' 
  AND token = 'wYX3aDwmggN7r6/JEEZjyW0cMYIosl786dgRkkq+EZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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