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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3deda4023f5c9adb56f20beee130fdd029a816e5a0369144859d636a1124b2' 
  AND token = 'wFpvwRzAHR/9SMHwIJBshHhUvWdSq2MTH5K/Siix95E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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