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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdfdc1760130c56faf60e93bde34c4e578406a8a2fd7e5afe0d260e8ccd4f6c' 
  AND token = '52laUEmADrpHGhZtyXFtNKc0lbO8fxQmQX1Efi2XG40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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