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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac0ac70d09de9b4322e525966f2815638a7dc7b4cb29819ec41884f99ecd4e1' 
  AND token = 'Q+7MsKZDnl8T6GKTcrT7Y2VYruPLOaqxJFs4XHKHjnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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