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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1095690592697152d35a4c95eb82a5f7bcaac8686b833f129e5d6a76a134c7' 
  AND token = 'tca4yrrjHzbTo88piq4hTT0zj1KqIzQTfIq2Y2UbpeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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