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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8190404765560e7e5c6d7e19dad54c5a5c1ae251d2ba470ee6346c0d367145c9' 
  AND token = 'b/5Ynoix5gsu4dJF6AQVBG/77p9xwQ+WjhIBTfSUGcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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