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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94139e50f0fd6179703a0ad1ef83ceaddc2666624f78a5b82543c046710655d' 
  AND token = 'DVwUflko2glB/QFGg4wWCfCC/arRTAT4AOBcTSyPSh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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