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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada65d1df4f39524d33c292af500629b9b13b8f3cb26dfa67ddc2a2c69a4ccda' 
  AND token = 'xZTsaXJFB/6rdV3pI0JpyUF1MpJ2UVIb2SLMVppyuX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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