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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568a59b307b06d45a6041a1b0fa7935922e2f45f161e90e153721db983196b1b' 
  AND token = 'xdGbWAEJxlWd7ccw3m5BMoDv7eNlj8PvJWm5SLp4Rys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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