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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ace55ffe2de4e904ad18423427c29edcc476c59767b06182898d238de4a4a5d' 
  AND token = 'fYP8p8B6tTUNrHFevwgVOryVnQkDIHSkj/GsbrCOz40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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