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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276286221d9eb1ac14a09877fdc381d83e75eb6aa5a376cf87421ba93007f3f3' 
  AND token = 'r89jGAn/ectErVFI6A14YLjByCENSuWYp7F9sttRmGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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