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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8830d5614b8ad9b50c4ed52c764a4f316a9553d3d76b36c3fd30af299d9b8d38' 
  AND token = 'PEcvHtOiMbMsAv2K6Oaw5G5k5lrnnPPLvgAGv+crPIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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