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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03b54a96f1a3d311a873d6037d5017093873758f259952b3869d6fa180b3863' 
  AND token = '4cl/XAF/+XBPfX3u7bLfS8DYpPyVzVdH7promqYL77U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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