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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32400f8d5b6ef41109c9be4ddc16e65fb1e185fe659f51017a00193fa8757674' 
  AND token = 'mQ/Xyhlvn4su0RFm5o2bYSTtF7U1rNpIqaxEq3WF+vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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