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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c34848e81eb9ebe88d145ebefab4d5ef5da880e1e4d20d0ba31be357fc0b9c4' 
  AND token = 'adKIbw6kZfb0r76kKvcQPsR4DaY2sMaqpQ5yridnMO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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