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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5a20ae7e14aeb8a1675a5f0f32a3d248a70ec5f0f7cf29645daa48a949fcf0' 
  AND token = 'GweFX5LBgXYXoDWzmOihPDerRdtuBfLDV2RoX2thYDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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