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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db37428a886928c12c0b175aeb18f1844e94d7381e8cb782bd40aa991a2be0ab' 
  AND token = 'BbmY0lAfMs71xqF2DxaxYoyZcABIdl7/2Cjug571p8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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