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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b937bf41f374da4506b53da20ae4c52ec87c03ecfc73c6f0a84f7b9140b88e9' 
  AND token = 'ic+z41beS+4agPryrmmslWsBJ1zVOPbEiGTed6uAgWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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