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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a99edeff73d7fd9ce4ac96b7c3f576390f6f46ba1ebe2e4989f60ea8d424af' 
  AND token = 'EoZzBeQSkHBwTPIWBgAiXiNHu79bm62qYJY3pbMMrZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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