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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f73f168441d59f2d5e90c85a9d737db1c9c0f71215d26836fc948df36fd7bd1' 
  AND token = 'wg/yoOtsIL+X2sYHkZgC6O24cdM5LzXsz3+wBaoEuxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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