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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaa0271a37eb85f3d54f61fd83c5d9a784193508b729fe08818d025eecf26b5' 
  AND token = 'uoVBr5zXnFL74BI1CnZoRIgtiIuAzsHb/4hMyKIlONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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