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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831febf486acd3b5b845560ff9f9681d41a3f810096b8e27e18c63b5fd63ebea' 
  AND token = 'WFkU/7NCL5fIp+qurTvfSayWSK7ajF1CrQW4tVGXa1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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