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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6546b7a8e9b1cfe709995a43ef324777103650dc92b824704de150fff04720fb' 
  AND token = 'wQmTO06YVaJ8l4rYoWpC1bZakj8RJ2//Z5Zn0NVHPhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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