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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad83eb9d8ba67340a3d8bd7371d60d5f87eb45336714b79b7498c428e0dc4ead' 
  AND token = 'WBG7GOu6IlRfJ1g0zauKFQPxfsvjjUyPhOOg3ia8gxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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