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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0be4baabb695d907c93f4ca317cad7ef9e39b7d2d55bd8a7ab4e0168769b4b' 
  AND token = 'vadBpjRBNsk4FxB1zPg86cW9alZ1Zc7MjTUl4sEvhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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